improved buffers

Makefile

@@ -1,5 +1,5 @@
 CXX= clang++-8
-CXXFLAGS= --std=c++17 -O3 -pthread -DGP_TESTS -DFUZZ_STRENGTH=500 -pedantic -Werror \
+CXXFLAGS= --std=c++17 -O0 -pthread -DGP_TESTS -DFUZZ_STRENGTH=500 -pedantic -Werror \
  -Wno-unknown-attributes \
  -g -fprofile-instr-generate -fcoverage-mapping
 # -fsanitize=address -fno-omit-frame-pointer

include/gp/buffer.hpp

@@ -119,5 +119,29 @@ namespace gp{
 				return buffer{(T*)nullptr,(size_t)0};
 			}
 		}
+
+		buffer trim_start(size_t rm_sz)
+		{
+			if(rm_sz<=size())
+			{
+				return buffer{begin().data + rm_sz, end().data};
+			}
+			else
+			{
+				return buffer{(T*)nullptr,(size_t)0};
+			}
+		}
+
+		buffer trim_end(size_t rm_sz)
+		{
+			if(rm_sz<=size())
+			{
+				return buffer{begin().data, end().data - rm_sz};
+			}
+			else
+			{
+				return buffer{(T*)nullptr,(size_t)0};
+			}
+		}
 	};
 }